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Topic: 1972 CB175 2-1 Exhaust Build (Read 5088 times)

I just finished up my exhaust build for my 72 cb175. I really fell in love with the Hooker 2-1 system and decided to do my best to make my own. I started with sourcing a decent used set of CL175 headers off ebay for $75 shipped to my door. The headers actually had the muffler still on it but I made a deal with the guy to lower his shipping if he would chop it off before sending (it was rusted through anyhow...). For the base of my Y pipe, I sourced some 45 degree elbows from jegs at 5.99 a piece http://www.jegs.com/p/Dynomax/Dynomax-Elbows/762720/10002/-1. To finish out the Y pipe build, I welded a scrap piece of 1.75" pipe I did get from the local muffler shop here in town...for free! The 1.75" size was the perfect diameter to fit in the muffler so I didnt have to use the supplied spacers. Also a side note....the internal diameter of the elbows from Jegs were absolutely the perfect size to squeeze over the OD of the scrambler headers. Couldnt ask for a better fit.

There was a muffler shop downtown Indy that carried 1.5" in stock and had a bender, but when I called and inquired about what a couple of elbows would cost me to make they quoted me $45 bucks! I'm all about shopping local, but this is a budget build. I finally ended the build with a reverse megaphone shorty muffler. Hopefully the pictures help show my progress. I'm no professional here...everything was done with either a hacksaw, bench grinder, hand grinder, and harbor freight welder. Throw in some high temp grill paint and exhaust wrap (not pictured...but it is wrapped now)....and I'm very happy with the results. Sounds mean as hell too!

Here are some pictures of the final product. I didnt include the first mock up picture when the Y pipe was first done. The headers were WAY too long, so off they came and I hacksawed more off....just behind the 2nd heat shield mounting tab. I then went ahead and removed the 1st tab as I do not plan on mounting any heat sheild to these.

Yes. Its a bit difficult to see, but the chrome bracket I used came with the muffler and is mounted behind the shock and ahead of the turn signal. I utilized one of the mounting bolts for the seat bracket.

Some "mods" to make the muffler fit better was I removed the chrome shroud from the shock, and cut down on the mount welded on the muffler to give me more room (I used the very end of the mount, so I removed the front part that I didnt need but was in the way). That along with bending the muffler bracket in to a Z shape and I've got plenty of clearance between the muffler and shock.

One of the biggest decisions I had to make here was to either weld the Y pipe to the headers, or use band clamps and clamp the headers to the Y. I decided to weld obviously, but the reason for the question is to get both headers into the head does take a little muscle as the original design was for them to go in one at a time. It worked welding...and I've got 2 1.5" exhaust band clamps I'm not using if anyone's interested.

AFter installing a set of the Hooker pipes you designed yours after, I would have welded one header and left the other loose like the factory design. I don't know how the head angles are set up on the 175 but on the 450 they are a bitch.

I very much considered that too. I had it mocked up with the clamps...and I just didnt like the look, even with only one clamp. Its a slight bitch to take off....but with the right pressure and finangling, it does come out of the headers without too much problem.